As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE UPGRADED ENGINE MOUNT WAS FOUND CRACKED. A PLUG USED TO RELIEVE WELDING PRESSURE AND ADD ADD LINSEED OIL APPEARS TO THE THE PROBLEM (STRESS RISER? ETC) THE LINSEED OIL ESCAPED AND MADE A PERFECT CRACK INDICATION WITHOUT USE OF DYE PENETRANT. THE OLDER STYLE, -1 MOTOR MOUNT DOES NOT HAVE PLUGS IN THIS AREA. (K)